website says about The Green Heart, a playground that uses human-generated electricity for lighting the zone at night time, to extend the usage of the facility into the evenings:
"It’s green, it’s shiny and it lights up at night.
It’s great for your health and it generates electricity.
It encourages kids and adults alike to learn about their health, energy generation and energy consumption."
(Plus it's made in Britain, nice to see some local enterprise and no outsourcing.....)
That's Daley Thompson in the photo, wow, I was a huge fan..........